Hey LovelyHamster1 ,
If s3 is what you're interested of, then the above would do the trick.
Note that you can attach the IAM using instance profiles. You can read about those here:
https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2_instance-profiles.html
Once you have an instance profile, you can add it to the autoscaler using the extra_configurations section in the autoscaler.
Under your resource_configurations -> some resource name -> add an extra_configurations section which is a dict of the boto3 format.
See IamInstanceProfile https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2.html#EC2.Client.run_instances and use the same types as in boto3.